APPLICATION OF PRESTACK SIMULTANEOUS INVERSION TO MESOZOIC RESERVOIR PREDICTION IN THE NORTH YELLOW SEA BASIN
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摘要: 北黄海盆地中生界目的层埋藏较深,储层纵横向变化快,厚度较薄,砂泥岩速度接近,造成纵波阻抗叠置,单纯依靠叠后纵波阻抗反演预测很难解决岩性区分和储层描述问题,而通过叠前同步反演得到的纵横波速度比和密度参数,进而转换为对岩性和物性敏感的其他参数,能有效区分砂泥岩,进行复杂岩性的识别和储层描述,提供更加准确的储层预测结果。利用叠前同步反演技术,对北黄海盆地中生界储层进行预测,刻画了目的层中砂体的空间几何形态,实现了对储层的精细描述,取得了较好的应用效果。Abstract: In the North Yellow Sea Basin, the Mesozoic reservoirs are deeply buried and drastic lithological changes occur in both the vertical and lateral directions. The velocity of sandstone is close to that of mudstone there. Therefore, it is difficult to use conventional logs to inverse reservoir characteristics. However, the pressure wave velocity, shear wave velocity and density parameters could be obtained from prestack simultaneous inversion, and then converted them into other sensitive parameters for lithology, porosity and effectively reservoir prediction. In this paper, prestack simultaneous inversion technology was applied to the predication of Mesozoic reservoir in the North Yellow Sea Basin. Sandstone geometry in some important traps is described in details and the good result has been obtained.
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